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Magnetic particles have important role in the current technology and this field of technology goes to broad progression. The term magnetic particles typically covers the paramagnetic and superparamagnetic one. Various materials like
iron oxide are common but other materials are available as well; survey of the materials is introduced in this work. They can
serve for technological purposes like separation and isolation of chemical products or toxic waste, use in diagnosis of pathologies, drug delivery and other similar applications. In this review, biosensors and bioanalytical devices, bioassays, are
discussed and introduced. Materials for magnetic particles preparation, methods of assay, biosensors and bioassays working
in stationary as well as flow though arrangements are described here. Survey of actual literature is provided as well.